Abstract: To investigate the influence of joint dip angle on the mechanical properties and crack evolution of rock masses with double parallel joints, samples with joint dip angles of 30°, 45°, 60°, and 75° are prepared. Uniaxial compression tests are conducted, and the entire failure process is monitored using a CCD camera and an acoustic emission (AE) system. The effects of varying dip angles on mechanical performance, maximum principal strain evolution, crack propagation patterns, and AE response were analyzed. The results indicate that the average peak strength of the samples increases with the dip angle, showing a 37.7% enhancement in the 75° sample compared to the 30° sample. The post-peak stress drop exhibits a characteristic pattern of “initial fluctuation followed by stepwise decline”. Strain concentration initiates at the joint tips and propagates outward; at failure, the high-strain zone is more fully developed around the lower joint than the upper one as the dip angle increases. Failure is dominated by tensile cracks. With increasing dip angle, the initial crack initiation site shifts from the lower to the upper joint, while the primary region of final significant rupture shifts conversely from the upper to the lower joint. During the failure stage, the AE event rate surges coincident with the stress drop. The RA-AF analysis reveals low RA and high AF values, further confirming a tensile failure mechanism consistent with macroscopic observations. These findings reveal the stress and strain evolution laws of double parallel jointed rocks under uniaxial compression and provide experimental references for similar studies.